Yes, it absolutely can. Levels 1 through 18 (low, medium and high on six different dial settings) on a Tri-Tronics Pro model go from nearly undetectable (even on a hairless human hand palm) to a box of raging hornets, with only slight gradations in between.
On every dog, there will be a level that causes no reaction whatsoever, and then one right above it where you'll see a head twitch or some other sign of recognition. This will vary from day to day and from one situation to the next on the same dog.
I've never been able to enforce a command on any of my dogs with anything lighter than a low 2, and I've never been UNABLE to stop a dog at full sprint dead in its tracks with a high 4. If I tried to break down each of those levels into five or six sub-levels, I'd have no time to train or hunt and I wouldn't be accomplishing anything to begin with. And besides, they'd be different again tomorrow.